What actions is a specific GPO doing

I am new to a specific environment that has some GPO's configured. Unfortunately, the old sys admin is not around anymore. There are a few policies on specific OU's that I would like to figure out the purpose of. The name of the GPO gives me some idea, but not entirely. Shy of going through every option in the GPO...is there a way...or perhaps a free tool that can tell me exactly how a specific GPO has been configured as compared to a default blank GPO?

You can also goto Start>Help and click on support. Click on Advanced system config in the bottom-left.
Then click "view Group Policies applied". It's a bit more cryptic than using GPMC as garyfafferty mentioned.
But it will give you similar results. Note that it will only return policies applied against the user who is logged in.

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